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Published: 2022-09-14

Two new Neotropical taxa of Radula Dumort. (Marchantiophyta: Radulaceae) with bordered leaves

Postgraduation Program in Biological Sciences – Tropical Botany (UFRA/MPEG), Museu Paraense Emílio Goeldi, Coordination of Botany, Av. Perimetral 1901, 66530-070 Belém, Brazil.
Museu Paraense Emílio Goeldi, Coordination of Botany, Av. Perimetral 1901, 66530-070 Belém, Brazil
Meise Botanic Garden, 1860 Meise, Belgium; Muséum National d’Histoire Naturelle, Institut de Systématique, Évolution, Biodiversité, 75005 Paris, France.
Liverworts Neotropics new species new variety Radula subg. Volutoradula taxonomy Bryophytes


Radula pallens var. marginata and R. smithii (subg. Volutoradula) are newly described from montane forests of Venezuela and Peru, respectively. Both taxa stand out by the presence of bordered leaf lobes. The new variety differs from R. pallens var. pallens in its narrow leaf border of one row of colorless cells with bulging trigones, while R. smithii stands out by a broad, 3‒5 cell rows wide, reddish-brown border made up of evenly thick-walled cells. A broad, pigmented leaf border of evenly thick-walled cells is also found in R. ligula from Brazil and Argentina, and in R. marginata (subg. Amentuloradula), from New Zealand, but the latter two species have very different lobules and stem anatomy. A full description and illustration of the two new taxa as well as comments on morphology, taxonomy and distribution are provided.


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